From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from NAM04-DM6-obe.outbound.protection.outlook.com (mail-dm6nam04on2067.outbound.protection.outlook.com [40.107.102.67]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DD0F21A5BA0 for ; Thu, 24 Apr 2025 03:07:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.102.67 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745464078; cv=fail; b=aikfzadRhAsnTiUPM3R++WqIoXi9utLhknEnZ9+eB0tMcaSPOiEQr3PZfOX+teq++CxvUPp8ujyxXWcxvG9w5DtRemOYSqInzZK73BSgMFoHE/dCjI0gOYxXtw11Tn7ZKn7coSOBVK+rhJG/AdLYJieq13cRYSoEMOBnQQ8z+FM= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745464078; c=relaxed/simple; bh=ds9catTmTN70Gx1Psvfj9SWTNTKAGHk2BlcqOKRfSb8=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=bUyPLIpYG6TbxGOhgdqYjNAh83ETTa8JciNvJadh0QXimfD4FmV4nEIDUBfTkLjQN3LQjd+CENmOZwfScfF7UF770br+ZqKT83AeLhH/ha/Ag/Na/3h//tITaN/K09X+pv5839IW0M4/WPvpXkHZUv+HwnX+Ekb2iRHFrA8Bg94= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com; spf=fail smtp.mailfrom=amd.com; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b=4BcyLo5i; arc=fail smtp.client-ip=40.107.102.67 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=amd.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b="4BcyLo5i" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=O+ueXqDATfg+AAiuqJ+0JE+G8qCqWcbN4+vir9W+JIPtiV3xG3Z9LkrPTBaZ1irEdE4fR4RyeZk1LFjakv5UTAbvAArt2b5yI4AmAnizI4p7YdwSVbkX+5aG1FU8YvL2Yv/cXzPo4fA4z12WcZ6+mfoejKQZ+wJbfzTsYfAMvygR20Sw1ykykJAZaby9CJTQvaATgYVgMRK9bCPCRjEqR8Ul1oZWuNwo9ekZyOJ852IxWin7DEo3BqMSVfVtNTspb3Q5GB0s/+DPmz6TJm3GIFRuA0nABuSk+p8gjf713PY3/tytY27W0CvNCifJIuAm73aCMH1mEzIDaI5lbfvXdQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=YujiokCRQZ0FHQongaKBGAFOEOKk5XnyanmZqHzYGqI=; b=M1XLTSayap928lkhiIcHl/Vzuyfvv4gIO27NjiDPVx0Ul38js1r6Z7P4sUlKsxPvit5+MCJP3Oer/rTzNh5ALgcL4MbTbDIXr3xMn9Zau6oP8CE+OIxuTeHfDQN3WAfQM3/aavbhSbRlWF2jT9iI9/iFuZ6r0ro9Zz6RJQvl+w2b04K0/vSb3qBuCDEnWt0C2KfBiV/nG777XMHzTdbfeiKenxYwS97qZkJkV9Kav2ZiAkeJvydM6crCIWnoQOQFWsbUcllbFyfAo9nFTTcAdwsU7jz0VOnwpmkeNCHTSSYa0WKw16+WxvXLueYeepIP7CpOZSNO/kPRTO/uAnvHRw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 165.204.84.17) smtp.rcpttodomain=lists.freedesktop.org smtp.mailfrom=amd.com; dmarc=pass (p=quarantine sp=quarantine pct=100) action=none header.from=amd.com; dkim=none (message not signed); arc=none (0) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=YujiokCRQZ0FHQongaKBGAFOEOKk5XnyanmZqHzYGqI=; b=4BcyLo5iZ3FiTWI2O/WhVaL8DGAybzLeHO0V8+NCh1i2X4r4Vm1kQeb4cV3iB2Xexc+sAB/wn3n/ViZQ2W1/7zggxb82CVD0yeFweexdnFcTrr8FSs9hwxswiOEZQFuppSA/5c2Y2jX9Pampemg6NEy2gq8M7xj5VakqMZr42VI= Received: from CH2PR03CA0024.namprd03.prod.outlook.com (2603:10b6:610:59::34) by CY3PR12MB9607.namprd12.prod.outlook.com (2603:10b6:930:103::15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8678.23; Thu, 24 Apr 2025 03:07:51 +0000 Received: from CH2PEPF00000142.namprd02.prod.outlook.com (2603:10b6:610:59:cafe::67) by CH2PR03CA0024.outlook.office365.com (2603:10b6:610:59::34) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.8655.36 via Frontend Transport; Thu, 24 Apr 2025 03:07:51 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB03.amd.com; pr=C Received: from SATLEXMB03.amd.com (165.204.84.17) by CH2PEPF00000142.mail.protection.outlook.com (10.167.244.75) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.8655.12 via Frontend Transport; Thu, 24 Apr 2025 03:07:51 +0000 Received: from SATLEXMB03.amd.com (10.181.40.144) by SATLEXMB03.amd.com (10.181.40.144) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Wed, 23 Apr 2025 22:07:50 -0500 Received: from localhost.localdomain (10.180.168.240) by SATLEXMB03.amd.com (10.181.40.144) with Microsoft SMTP Server id 15.1.2507.39 via Frontend Transport; Wed, 23 Apr 2025 22:07:47 -0500 From: Wayne Lin To: CC: , , , , Wayne Lin , Subject: [PATCH 1/2] drm/dp: Correct Write_Status_Update_Request handling Date: Thu, 24 Apr 2025 11:07:33 +0800 Message-ID: <20250424030734.873693-2-Wayne.Lin@amd.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250424030734.873693-1-Wayne.Lin@amd.com> References: <20250424030734.873693-1-Wayne.Lin@amd.com> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit Received-SPF: None (SATLEXMB03.amd.com: Wayne.Lin@amd.com does not designate permitted sender hosts) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH2PEPF00000142:EE_|CY3PR12MB9607:EE_ X-MS-Office365-Filtering-Correlation-Id: 0e6e3784-4b6b-42d0-c4f1-08dd82dd32f5 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|36860700013|1800799024|82310400026; X-Microsoft-Antispam-Message-Info: =?utf-8?B?Yk1BdkZpODI2RUhabFNHckZJZnNRMVRjLzBNdWVUWWk0UVNtTGVPWEVCSldV?= =?utf-8?B?RWh4VE1naUtQdGZ5OHBvRHgxTTJoc0d5bEpyU2xMUGU4L3k5TTQyODg3ells?= =?utf-8?B?NnVJRXkraXlqTkgxN1o4Uk5zM1RLSWtGMGgrb3ZOY3UwYkVlN2F6WXQzKy9P?= =?utf-8?B?SWlvdDdvZ0s2Vy9jM2VsSW9nUXBKM296TXl6TG9ncEhJVy9kcnRQcXZEd3d2?= =?utf-8?B?dVc5d3FxUGw1bE5WM25BMGV4T0E1MWE2MHR1UGVWdlVlaDEvSXFZMCsyN1Bt?= =?utf-8?B?Ym9sSjNGQVE0OUU4djZ3MEpZN0pKa1B2UEh3NjVPdTEwcnZ0c0RzWkJOUUM2?= =?utf-8?B?ZlJEZ3E3L0VJQWhTb0l0ajVTNThFTUZXQ2Rjb1BOZlZ4YUs2UUp6cUExYlI0?= =?utf-8?B?Mk15VDhiZlJsVnBSbHEvbTBYc2xyMDNVaU1sUWpQU0xUc2JIRE8zM3BzOXpq?= =?utf-8?B?Z2JtYzM1b0NKeWR6bEsvSGNWMDdRVEdGZ0Z1NThFLzJTMXYvdURhbGdqU0Vk?= =?utf-8?B?VHllNlQwUUx2WlcrelRqVXZlOU5YS3h6b1A3OHlOblRwN3NnSjNON09tVXpj?= =?utf-8?B?eEhaaVBlMHlrUXhFNHJoU2lVYXEvMkVNb1lMN3hYVVVKZlBIVzgvTjI0VVB0?= =?utf-8?B?RG11OE02WEhxOGx3V2VJVmtOaW9md1dOSk9yRlp4K1BhK0dVcFZINGxkaXpu?= =?utf-8?B?eGZRNjFNUXJsU09kSnRKVXFxQjNyQ0ZYSUdBN1B6Z2hFUzdNbURPNFJYK2R5?= =?utf-8?B?RXVpKzQ5dFlQSitRdUhydzcreWJHRTFvMGhHK3R2dXNVYzRQM3k0aENhblhX?= =?utf-8?B?ZlhnOXhIOHR1QzJ2bTlwbzZZOG9PU2NNZ0pQMUE5cmRGZWhaSnh2eVh1VzNr?= =?utf-8?B?QWxYOHg0QWNGbFcvN0hJWWRCc0RDUmNDcjZoVUIrZ21aMVBlNEVqQjdSVFd4?= =?utf-8?B?QXR3MnpYTVhlTzJ6VGFHWDduQ3A2SUZlSUJVZDRNRDFaV2wwRmN2Tm1SNGZz?= =?utf-8?B?NkZMSnJRUFM4R1dDMFZkOExldUo1UGRFRTNFaTFBWkJySVBGVi8zOUdJTjZ4?= =?utf-8?B?U29hQ1Z4eE1JdlI0ZnhWakFRa08yV3g3cm84T2I5b245TFNKd2xycTRwSy9W?= =?utf-8?B?ckhiUlkwYzBBNk80SGQvL3Fiemx1dFBPOFlyWldPKzdqelU3aUd4V040NTFv?= =?utf-8?B?TUNySFhISDlyNFpWYmdyMXdubDRpWWY3bkQwTDZ0ZjlKQW5aMjdJbUJNNEht?= =?utf-8?B?cktLbVQzY1dHTDNrbVVvYmdxNktIU2l4RW1Cd251QTlkbVQ1eTRjamhCTUw4?= =?utf-8?B?VnA2bUQvZG1jNHJnT3ovUEVjbHM0dFdISFdNemVnUUkrSTVTelJDOWdiY2J2?= =?utf-8?B?OHR3blFqSFoyS0pnUGY5RGVZMGlLSXBTa0tvSkk2M0JBYzlibEorTnZaL2l4?= =?utf-8?B?QXVtcFNqR1hKNU1UOWphRVFaN1lTWWJYYWtGZHhEZm9QSVhTT1BxRlpQNGJx?= =?utf-8?B?d2hDcnZnNUJzUU9MVUxUelN3dG53Y2dmNU9KSFowenJ3elhUR0xWcGdIanJx?= =?utf-8?B?aCtzWXFaQ0w3WmI0OVBGazVmK0V5Ri9NcFU4a2hLd0tWSG51Zm9wK1hsdGpn?= =?utf-8?B?K3BUNG1yQU1odXNtWkNGdzJVNEVpSVU5TU8rZzJQUHU1KzJTcTlraG1HUG96?= =?utf-8?B?VU10TitHbVc1R2tMSzNYKzEwUTZxaDlxN256c0ovekNNNFUrVVF0L3FmaytS?= =?utf-8?B?QVlJcUhUSDZ3QklobmEvRlhWWVhtcG12TnYrWHRqaytlUmFMSzJZYVRGRXJv?= =?utf-8?B?dTR2SWdSc3J3VUNXMm5TUnlJdmNNR0owbWNJeDlSQVU1dTFxS3hrZTdYcGJ6?= =?utf-8?B?bFNQbGFWQmJaM3l5TzJDUFhST09jNWhLbDVaWXZMN2l1eFdVSVhMcExEL0pY?= =?utf-8?B?OFFLdnFuL1NoTlZpRlFiaWxtNHFpTXkrcW9EcTBJUzdHWlQ0MWxRRk9Qd2R3?= =?utf-8?B?OUZ3VnlJRjltcXU4WUhqY2RsOVE0Lzc3a1UzQkcxdDZ1Q3I5alhnekFNMjdu?= =?utf-8?Q?ml1F2u?= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB03.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(376014)(36860700013)(1800799024)(82310400026);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Apr 2025 03:07:51.0198 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 0e6e3784-4b6b-42d0-c4f1-08dd82dd32f5 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CH2PEPF00000142.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY3PR12MB9607 [Why] Notice few problems under I2C-write-over-Aux with Write_Status_Update_Request flag set cases: - I2C-write-over-Aux request with Write_Status_Update_Request flag set won't get sent upon the reply of I2C_ACK|AUX_ACK followed by “M” Value. Now just set the flag but won't send out - The I2C-over-Aux request command with Write_Status_Update_Request flag set is incorrect. Should be "SYNC->COM3:0 (= 0110)|0000-> 0000|0000-> 0|7-bit I2C address (the same as the last)-> STOP->". Address only transaction without length and data. - Upon I2C_DEFER|AUX_ACK Reply for I2C-read-over-Aux, soure should repeat the identical I2C-read-over-AUX transaction with the same LEN value. Not with Write_Status_Update_Request set. [How] Refer to DP v2.1: 2.11.7.1.5.3 & 2.11.7.1.5.4 - Clean aux msg buffer and size when constructing write status update request. - Send out Write_Status_Update_Request upon reply of I2C_ACK|AUX_ACK followed by “M” - Send Write_Status_Update_Request upon I2C_DEFER|AUX_ACK reply only when the request is I2C-write-over-Aux. Fixes: 68ec2a2a2481 ("drm/dp: Use I2C_WRITE_STATUS_UPDATE to drain partial I2C_WRITE requests") Cc: Ville Syrjälä Cc: Jani Nikula Cc: Mario Limonciello Cc: Harry Wentland Cc: stable@vger.kernel.org Signed-off-by: Wayne Lin --- drivers/gpu/drm/display/drm_dp_helper.c | 27 +++++++++++++++++++++---- 1 file changed, 23 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/display/drm_dp_helper.c b/drivers/gpu/drm/display/drm_dp_helper.c index 6ee51003de3c..28f0708c3b27 100644 --- a/drivers/gpu/drm/display/drm_dp_helper.c +++ b/drivers/gpu/drm/display/drm_dp_helper.c @@ -1631,6 +1631,12 @@ static void drm_dp_i2c_msg_write_status_update(struct drm_dp_aux_msg *msg) msg->request &= DP_AUX_I2C_MOT; msg->request |= DP_AUX_I2C_WRITE_STATUS_UPDATE; } + + /* + * Address only transaction + */ + msg->buffer = NULL; + msg->size = 0; } #define AUX_PRECHARGE_LEN 10 /* 10 to 16 */ @@ -1797,10 +1803,22 @@ static int drm_dp_i2c_do_msg(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg) case DP_AUX_I2C_REPLY_ACK: /* * Both native ACK and I2C ACK replies received. We - * can assume the transfer was successful. + * can't assume the transfer was completed. Both I2C + * WRITE/READ request may get I2C ack reply with partially + * completion. We have to continue to poll for the + * completion of the request. */ - if (ret != msg->size) - drm_dp_i2c_msg_write_status_update(msg); + if (ret != msg->size) { + drm_dbg_kms(aux->drm_dev, + "%s: I2C partially ack (result=%d, size=%zu)\n", + aux->name, ret, msg->size); + if (!(msg->request & DP_AUX_I2C_READ)) { + usleep_range(AUX_RETRY_INTERVAL, AUX_RETRY_INTERVAL + 100); + drm_dp_i2c_msg_write_status_update(msg); + } + + continue; + } return ret; case DP_AUX_I2C_REPLY_NACK: @@ -1819,7 +1837,8 @@ static int drm_dp_i2c_do_msg(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg) if (defer_i2c < 7) defer_i2c++; usleep_range(AUX_RETRY_INTERVAL, AUX_RETRY_INTERVAL + 100); - drm_dp_i2c_msg_write_status_update(msg); + if (!(msg->request & DP_AUX_I2C_READ)) + drm_dp_i2c_msg_write_status_update(msg); continue; -- 2.43.0